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Originally published as JHC exPRESS on September 17, 2007.
doi:10.1369/jhc.7A7289.2007
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Journal of Histochemistry and Cytochemistry
Volume 56 (1): 25-31, 2008
Copyright ©The Histochemical Society, Inc.

Expression and Localization of Gonadotropin-releasing Hormone Receptor in the Rat Oviduct During Pregnancy

Anamika Sengupta and Rajagopala Sridaran

Department of Physiology, Morehouse School of Medicine, Atlanta, Georgia

Correspondence to: Rajagopala Sridaran, PhD, Professor, Department of Physiology, Morehouse School of Medicine, 720 Westview Drive S.W., Atlanta, GA 30310-1495. E-mail: rsridaran{at}msm.edu

A recent study from our laboratory has shown cellular and ultrastructural distribution of the gonadotropin-releasing hormone (GnRH) and the relative expression of its mRNA in the rat oviduct during the postimplantation period of pregnancy (days 7, 9, 16, and 20). To determine the possible autocrine/paracrine involvement of the oviductal GnRH during pregnancy in rats, the present investigation aims at the study of the relative expression of GnRH receptor (GnRHR) mRNA by real-time PCR followed by immunolocalization of the peptide in the oviduct during pregnancy. Semiquantitative analysis of the oviductal GnRHR expression by Western blot was done by densitometry of the signal intensity. Our results indicate the expression of GnRHR mRNA in the rat oviduct throughout the postimplantation period of pregnancy with no significant difference in expression between the selected time points. Immunoreactive GnRHR peptide was localized predominantly in the cytoplasm of the luminal epithelial cells, with less expression in the cytoplasm of the stromal cells and the smooth muscles throughout the oviduct. Signal intensity of GnRHR was significantly lower during day 16 when compared to days 7 and 20. These results, for the first time, support the transcription of GnRHR mRNA and its translation to protein in the rat oviduct throughout the postimplantation period of pregnancy. The lower protein content of GnRHR by day 16 may be indicative of ligand-induced downregulation of the receptor expression. The present investigation thus strengthens our previously postulated hypothesis regarding the receptor-mediated autocrine/paracrine role of oviductal GnRH during pregnancy in rats. (J Histochem Cytochem 56:25–31, 2008)

Key Words: gonadotropin-releasing hormone receptor • oviduct • pregnancy • rat


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